Answer the following questions using your own words.
1.	What are some advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design? (Must identify at least one advantage and one disadvantage per design - so four total).
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2.	What is a confound and how is it related to internal validity?
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3.	What is the relationship between external validity and the college sophomore problem?
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4.	On the most recent exam in your biology class, every student earned an A. The professor claims that he must really be a good teacher for all of the students to have done so well. Given the confounds discussed this week, what alternative explanation can you offer for this result? (Don't just list a concern- briefly provide a justification).
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5.	A health magazine recently reported a study in which researchers claimed that women who take iron supplements have better problem-solving abilities. Further investigation revealed that they assessed problem-solving abilities in a group of women and then had the women self-report whether or not they take iron supplements. Discuss one potential threat to internal validity as it relates specifically to this study.
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